CN215033274U

CN215033274U - Cold heading forming die for blind rivet

Info

Publication number: CN215033274U
Application number: CN202120070292.1U
Authority: CN
Inventors: 胡道正; 王健国
Original assignee: Howmet Fastening Systems Suzhou Co Ltd
Current assignee: Howmet Fastening Systems Suzhou Co Ltd
Priority date: 2021-01-12
Filing date: 2021-01-12
Publication date: 2021-12-07
Anticipated expiration: 2031-01-12

Abstract

The utility model discloses a rivet cold-heading forming die relates to punching press technical field, aims at solving three mould cold-heading forming processes, and the product becomes curved easily, and cold-heading forming die is many, increases the mould cost, and the shaping station is many, transfers the problem that the quick-witted time becomes long. The technical scheme is that the riveting device comprises a first station, a second station, a third station, a fourth station and a fifth station for realizing final forming of a rivet head and deformation of a rod part size beam, wherein a stamping die of the fourth station comprises a preforming stamping shell, a preforming stamping rod and a preforming stamping core, and the preforming stamping core is provided with a horn-shaped opening; the main die of the fourth station comprises a preforming die shell and a preforming die core arranged in the preforming die shell, wherein a cushion block is arranged on the bottom surface of the preforming die shell, and an ejector rod is connected to the cushion block. Three-die cold heading forming is changed into two-die cold heading forming, the problem of product bent rod is solved, the number of dies participating in forming is reduced, the difficulty of machine adjustment is reduced, the time of machine adjustment is reduced, and the cost of the dies is reduced.

Description

Cold heading forming die for blind rivet

Technical Field

The utility model belongs to the technical field of the technique of punching press and specifically relates to a rivet cold-heading forming die is related to.

Background

The cold heading process is one of the novel processes for machining less and no cutting metal under pressure. The method is a processing method which utilizes the plastic deformation generated by metal under the action of external force and redistributes and transfers the volume of the metal by means of a die so as to form the required part or blank. The cold heading process is most suitable for producing standard fasteners such as bolts, screws, nuts, rivets, pins, and the like.

Referring to fig. 1 and 2, a conventional cold heading forming die for a drawn rivet comprises a first station 1, a second station 2, a third station 3, a fourth station 4 and a fifth station 5 from material shearing to forming, wherein each station consists of a main die and a punching die. The main motor of the cold header drives the punching die to reciprocate, so that the extrusion forming and ejection of the product in the die are realized. Meanwhile, the transverse movement of the clamp is realized through a mechanical mechanism to realize material clamping and conveying, the product is transferred from the previous station to the next station through the clamp, and the machine has five pairs of clamps in total. The first station 1 and the second station 2 are designed as overmolds, and the material does not deform when passing through the first station 1 and the second station 2 after being cut and only plays a role in transition. Extruding and deforming at a third station 3 to prepare for the head of a product at a fourth station 4; the fourth station 4 is further extruded to deform into the final head shape of the product. The die of the fourth station 4 comprises a die shell 41 and a die core 42 arranged in the die shell 41, and a clamping groove 43 matched with the rivet head is formed in the bottom surface of the die core 42. The fifth station 5 mainly has the function of forward extruding the product rod part of the fourth station 4 once through the rod bundling die in the main die to reach the designed size of the product.

The above prior art solutions have the following drawbacks: in the three-die cold heading forming (total five stations, forming by the last three stations), a product is easy to bend, the number of cold heading forming dies is large, the die cost is increased, the number of forming stations is large, and the machine adjusting time is long, so that the improvement is needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a rivet cold-heading forming die, it has the effect that reduces the fashioned mould quantity of participation, reduces the machine time of transferring, reduces the mould cost.

The above technical purpose of the present invention can be achieved by the following technical solutions:

a cold heading forming die for a blind rivet comprises a first station for over-molding, a second station for over-molding, a third station for over-molding, a fourth station for extrusion molding and a fifth station for realizing final forming of a rivet head and deformation of a rod part size beam, wherein the first station, the second station, the third station, the fourth station and the fifth station respectively comprise a main die and a stamping die; the stamping die of the fourth station comprises a pre-forming stamping shell, a pre-forming stamping rod and a pre-forming stamping core, wherein the pre-forming stamping rod and the pre-forming stamping core are coaxially arranged in the pre-forming stamping shell, and a horn-shaped opening is formed in the end face, opposite to the main die of the fourth station, of the pre-forming stamping core; the main die of the fourth station comprises a preforming die shell and a preforming die core which is arranged in the preforming die shell and matched with the preforming die core, wherein a cushion block is arranged on the bottom surface of the preforming die shell, and an ejector rod extending into the preforming die core is connected to the cushion block.

The utility model discloses further set up to: and a spring guide rod which is abutted against the end part of the preforming stamping rod is arranged in the preforming stamping shell along the axial direction of the preforming stamping shell, and a spring is coaxially sleeved on the spring guide rod.

The utility model discloses further set up to: the main die of the fifth station comprises a forming die shell and a forming die core arranged in the forming die shell.

The utility model discloses further set up to: the die of the fifth station comprises a forming die shell and a stamping block arranged in the forming die shell, and the cross section of the stamping block is rectangular.

To sum up, the utility model discloses a beneficial technological effect does:

the three-die cold heading forming is changed into the two-die cold heading forming, dies of the first station to the third station in the five stations of the machine are designed to be over-molded and do not participate in product forming, the original head preforming of the third station is changed into the head preforming of the fourth station, the head forming of the fourth station and the diameter reduction of the beam rod of the fifth station are combined to be formed at the fifth station, the final forming of the head of the product is realized, the size beam rod deformation of the rod part of the product is also realized, the problem of product bent rod is solved, the number of dies participating in forming is reduced, the difficulty of machine debugging is reduced, the time of machine debugging is reduced, and the cost of the dies is reduced.

Drawings

FIG. 1 is a schematic view of the overall structure of a mold in the background art;

FIG. 2 is an enlarged schematic view of portion A of FIG. 1;

fig. 3 is a schematic overall sectional structure diagram of an embodiment of the present invention;

fig. 4 is an enlarged schematic view of a portion B in fig. 3.

In the figure, 1, a first station; 2. a second station; 3. a third station; 4. a fourth station; 41. punching a shell; 42. punching a core; 43. a card slot; 5. a fifth station; 6. performing shell punching; 61. performing a stamping rod; 62. performing core punching; 621. an opening; 63. a spring guide rod; 631. a spring; 7. performing a formwork; 71. preforming the mold core; 72. cushion blocks; 73. a lifter bar; 8. forming a stamping shell; 81. stamping the blocks; 9. forming a mould shell; 91. and (5) forming a mold core.

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.

Referring to fig. 3 and 4, for the utility model discloses a blind rivet cold heading forming die, including first station 1 that is used for the overmould, second station 2 that is used for the overmould, third station 3 that is used for the overmould, fourth station 4 that is used for extrusion, and realize rivet head final forming and the deformation of pole portion size beam pole fifth station 5, first station 1, second station 2, third station 3, fourth station 4, fifth station 5 all include master die and die; the die of the fourth station 4 comprises a preforming punch shell 6, a preforming punch 61 coaxially arranged in the preforming punch shell 6 and a preforming punch core 62, wherein the preforming punch 61 can slide. The end surface of the pre-forming punching core 62 opposite to the main die of the fourth station 4 is provided with a horn-shaped opening 621; the main mold of the fourth station 4 comprises a preforming mold shell 7 and a preforming mold core 71 which is arranged in the preforming mold shell 7 and matched with the preforming punch core 62, a cushion block 72 is arranged on the bottom surface of the preforming mold shell 7, and an ejector rod 73 extending into the preforming mold core 71 is connected to the cushion block 72. The ejector pin 73 is positioned to confine the material of the product head within the preform core 62.

Referring to fig. 3 and 4, a spring guide 63 abutting against the end of the pre-forming punch 61 is disposed in the pre-forming punch housing 6 along the axial direction thereof, and a spring 631 is coaxially sleeved on the spring guide 63. After one-time stamping is finished, the resetting of the stamping die is realized under the action of the spring 631. The main mold of the fifth station 5 comprises a molding mold shell 9 and a molding mold core 91 arranged in the molding mold shell 9, the die of the fifth station 5 comprises a molding punch shell 8 and a punching block 81 arranged in the molding punch shell 8, and the cross section of the punching block 81 is rectangular.

The implementation principle of the embodiment is as follows:

the three-die cold heading forming is changed into two-die cold heading forming, and dies from the first station to the third station in the five stations of the machine are designed to be over-molded and do not participate in product forming. The original head preforming of the third station 3 is changed into the head preforming of the fourth station 4, the head forming of the fourth station 4 and the diameter reduction of the binding rod of the fifth station 5 are combined and formed at the fifth station 5, the final forming of the head of the product is achieved, and the size binding rod deformation of the rod part of the product is also achieved.

The problem of product bent rod is eliminated, the number of the molds participating in forming is reduced, the machine adjusting difficulty is reduced, the machine adjusting time is reduced, and the mold cost is reduced.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. The utility model provides a blind rivet cold-heading forming die which characterized in that: the riveting device comprises a first station (1) for overmoulding, a second station (2) for overmoulding, a third station (3) for overmoulding, a fourth station (4) for extrusion forming and a fifth station (5) for realizing final forming of rivet heads and deformation of a rod part size beam, wherein the first station (1), the second station (2), the third station (3), the fourth station (4) and the fifth station (5) comprise a main die and a stamping die; the stamping die of the fourth station (4) comprises a pre-forming stamping shell (6), a pre-forming stamping rod (61) and a pre-forming stamping core (62), wherein the pre-forming stamping rod is coaxially arranged in the pre-forming stamping shell (6), and a horn-shaped opening (621) is formed in the end face, opposite to the main die of the fourth station (4), of the pre-forming stamping core (62); the main mold of the fourth station (4) comprises a preforming mold shell (7) and a preforming mold core (71) which is arranged in the preforming mold shell (7) and matched with the preforming punching core (62), a cushion block (72) is arranged on the bottom surface of the preforming mold shell (7), and an ejector rod (73) extending into the preforming mold core (71) is connected to the cushion block (72).

2. A blind rivet cold heading forming die as claimed in claim 1, wherein: a spring guide rod (63) which is abutted against the end part of the preforming punch rod (61) is arranged in the preforming punch shell (6) along the axial direction of the preforming punch shell, and a spring (631) is coaxially sleeved on the spring guide rod (63).

3. A blind rivet cold heading forming die as claimed in claim 1, wherein: the main die of the fifth station (5) comprises a forming die shell (9) and a forming die core (91) arranged in the forming die shell (9).

4. A blind rivet cold heading forming die as claimed in claim 3, wherein: the die of the fifth station (5) comprises a forming die shell (8) and a stamping block (81) arranged in the forming die shell (8), and the cross section of the stamping block (81) is rectangular.